If you mean Charlotte la Bouff, which it probably is. The answer is kinda obvious.

or Snow White or Anna..I guess...perhaps..

Oops, I meant to leave Tia out. My bad.

Or Rapunzel

They best friends. :3

Second prolly Ariel.

deffo :3 ariel is like charlotte in personality but charlotte would care more about princesses who are like fairy tale characters not modern ones

aurora is the ultimate fairy tale princess and Lottie would adore her.

^That's an amazing point!

If Tiana isn't included I think it would be Cinderella, because Tiana and her are similar, and since Tiana is Lottie's best friend I think she appreciate (even if they're not similar to her) the girl who are similar to Tiana (if that make sense xD) plus she's a true fairy tale princess with a puffy sparkly dress